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Equity Investees (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Apr. 01, 2016
Mar. 31, 2016
Schedule of Equity Method Investments [Line Items]        
Unamortized excess cost amount $ 366.4 $ 382.4    
Enterprise Offshore Acquisition | Deepwater Gateway LLC        
Schedule of Equity Method Investments [Line Items]        
Equity interest step up acquired percentage     100.00% 50.00%
Transaction costs related to business acquisition       $ 26.0